How is this rock formed?

How is a rock formed if it has pebbles on it in different sizes, cemented together?

A) by magma cooling underground B) by lava cooling above the ground C) by heat and pressure under the ocean D) by compaction of sediment and chemical changes

Answer #1

id say b

Answer #2

it’s b

Answer #3

I’s say D, but I’m not 100% on that, sorry.

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